Grinding-machine



l. A. KNOWLES.

GRINDING MACHINE.

APPLICATION FILED FEB. 27, I920.

153672150. Patented Feb. 1, 1921.

4 SHEETS--SHEET I.

j INVENTOR. B

TORNEY.

1. AI KNOWLES.

GRINDING MACHINE. APPLICATION FILED IEB. 21. Iezo.

1,367,150. Patented Feb. 1, 1921.

4 SHEETS-SHEET 2- I NV EN TQR.

I/fm@ J. A. KNQwL'Es. GRINDING MACHINE.

4 SHEETS-SHEET 3.

IIHIIH?" IlllllllllIlIllllllllllllllllllllll INVENTOR.

J. A.`KNOWLES.

GRINDING MACHINE. rrucmon min rsa. 21. lazo.

Pan'm m 1, 1921.

. 4 susan-snm 4.

KQ/3 YY my@ 1 INVENTOR.

ToRNEY.

fifi

PaTENT OFFICE.

JAMES ii. mvovvniis,` or BALTIMORE, iiicsnrruilinn- Grammars-MACHINE.

Specication of Letters Patent.

rammed Feb. 1, 1921.

Application led February 27, 1920. Serial No.` 361,853-

i" all 207mm. it may conce/ra:

Be it known that l, .latins A. KNoWLiis, a citizen of the United States, residing at Baltimore city and State oi Maryland, `have if. invented certain new and useful Improve ments in Grrindingh/.lachines7 of which the following is aspecilication.

This invention relates to machines `toi' grinding the valves oit motor-vehicle enu gines, and its object is to provide a simple and eiiicient machine ot' lthis kind 'which per mits all the valves oi anengi-ne to b'e ground at one time, and which is entirely automatic in its operation.` i

The invention'also has `for its object to provide a novel and improvedirniechanisrn` whereby the grinding operation is `effected byan alternating rotarymotion ot the valves on their seats, the valves being periodically lifted oil their seats to prevent the formation of scratches running aroundthe entire cir-` cumference of the valves and the seats thereof.

Other objects and advantages of the in- V vention will be pointed out in the detailed description appearing hereinafter, and in order that the same `may be better understood, reference is had tothe accompanying drawings forming a partei:` this specifica-n tion.

In the drawings, Figure 1' is an elevationv of the machine `minus the `cover ofxa gear case orhousing; Fig. 2 is anenlarged section""on theline 2-2 of Fig." lshowiiiqthe` valveiassembly inplace `on theinachineg Fig. 3 is a horizontalsection on the line 3--3 of Fig. 1; Fig; llis an enlarged sectional Adetail on the line lr-4l ot Fig. 3; Fig. 5 is a plan View "showing 'the develop` ment of a cam; Fig` A6 is adiagram of a gearing; Fig. 7 is asectio`nal" detail `of a valve holder; Fig. 8 is a plan or end viewof said holder, and Fig. 9 is across-section on the line Sli-9 of Fig; 7.

The machine has been 'designed more particularly for grinding' the valves `ot' the Chevrolet motor, this type of nioto'rlhaving an upperreinovable cylinder block section 10 carrying the' valve assembly. Fig. 2 shows this section, and one of the valves 11, with its stem 12. The design `ot the parte is such that when the section 10 is removed from the remainder of the cylinder block,`

the valve stems are left exposed and 'depending, as shown in Fig. 2. *It will there-` `fore be seen that by applying a rotatable chuck or holder to the valve stem, the valve may be rotated back and forth on itsseat and thus ground to obtain a perfect seating. The machine has been designed to grind the entire `set :of valves` simultaneously, and `al`` though the machineis adapted more particu-` t larly for Chevrolet motors, itfis `not limited thereto, but may beA used ior grinding valves oi other motorsiiiiwhich the valve assembly the shank 16 is enlarged'and formed with a `socket 17 to seat the end of the valve stem,

as shown in Fig. 7. On. the outside of the socketend of the shank 16 are diametrically opposite ears 18 to which are pivoted, as

i `shown at 19. levers 20 carrying latch pins 21 which extend through Vapertures in the wall of the socket to enter the socket transversely and seat at theirextrernities ina transverse aperture inthe valve stein. `Frein the levers 20 extend pins 22 which areconnected `bysprings 23 tensioiiedto normally draw together the lever ends carryingr the latch pins 21, thereby advaiicingthe latter to holding position. Upon pressing the levers-together to spread their ends carrying the latch pins," the latter are retracted to release the valve stem. f

A loose connection is Aprovided between the Parts "14 and lzg'to permit a limited degrec of lateral plavif the valve stern which is being held is slightly bent. By allowing this lateral play; the 4valve is ground perfectly true and circular notwithstanding thebend in the valve stein, and the valve is not `ground oval; Thelose lconnection is obtained by bolts 24 passing through regis teringapertures 251in the" parts 14 and 15, said wape'i'tures* being elongated radially.

`The parts 14 and 15 are also encircled by in a bearing 29, and carrying at its upper end a collar 30 secured by ascrew 3l, and serving to prevent the pinion from slipping down in the bearing. The spindle 13 is free to slide up and down in the pinion and its hub, and in order to transmit the rotary niotion' of the pinion to the spindle, the pinion hub carries transverse screws 32 seating in a longitudinal groove 33 in the spindle.

The spindle 13` depends at its lower end from the pinion 27 so that said end may Seaton a lifting cam 34. This cam is on a shaft 35 located in a housingV 36 and supported at one end in a bearing 37 on one of the 'end walls of the housing. rThe other end of the cam shaft is supported by a partition 33 adjacent to the oppositeend of the housing, and the cam shaft is also Supported intermediate its ends by a bearing 39 rising from the floor ofthe housing.

Around the spindle 13 is fitted a. coiled springfl() for forcing the spindle downward te follow` the cani 34. rlhis spring; seats at itsl lower end against an adjustable abutment-4l on the spindle, said abutment being esst-collar, and the upper end of the spring'.

seats against anV abutment 42 in the form of "a Washer seating' against the under side of the top of the housing,` 36.

It' will be evident from the foregoing', that the spindle 13 is rotated by the pinion- .27,

Vand that through the cani 34 and the spring A it is givenA a reciproeatory motion in the `A valve operating` means as hereinbefore described is provided for each valve, the shaft 35 having` a number of Canis 347 one `ifor v'each spindle 13. The pinions 27 are also geared together as shownin Figs. l and 6. 'It' "will be noted in Fig'. 6, that some. of the'pinions are not dii-eetlv in mesh with each other, idlersV 43 being provided. This vis necessary as the spacing; of the spindles` which conforms to the spacing of the valves; is not uniform. f

@ne end of the hou'sing'36`is entered by aj -fing to be presently described, imparts motion-to a'grea'r 45 which isr'in mesh. with a gear. 46 ont-he camshaft '35.' to drive the latter, shaft 44 obtains motion from any suitable power source.

-At oneend of the train of pinions 27 and Vwith a bevel gear 43 isv a pinion 47 for driving said train. .'lhis drive pinion is ona shaft'47a' provided 48 meshing with two oppositely facing bevel gears. 49 andO, re-

'spectivelyA The bevel 'gear 49 is keyed or otlierwiser'inade.fast toa shaft 51, and the Y L ',earti()`l is loose onsaid shaft.- A spacing sleeve 52 is interposed between the `gears 49 and 50. rl`he grear 49 has un extension provided with teeth to forni a spur lrear 53. and the rear 50 is in a like manner provided with a spur lQeai 54. The `gear 4.3 is fastened on shaft 5l to turn therewith.

At 55 is shown a loinritudinally slidahle shaft eariyingi` spur gears 56 and 57 fast on said shaftto turn therewith. The near 56 is adapted to come in inesh with the rear 53, and the gear 57 in mesh with the gear these pairs of `gears being alternately intei'ineshed by sliding; the, shafts 55, rlhe drive shaft 44 has a pinion 5S which is in mesh with a spur gear 59 on the, shaft 55, whereby the motion of the shaft 44 is transmitted to the shaft 55.

rlhe longitudinal sliding' inoif'einent of the shaft is obtained by a stationary abutment 6U seating' in a cani `groow 6l inude in a. collar 62 fast on said shaft. lllhen the shaft is rotatiniej. the abutment seating in the cani groove 6l, causes the shaft to reciprocate` the cani groove being designed to give such a range of travel to the shaft that the ,gears 56 and 57 are alternately eari'ied into mesh with their companion gears 53 and 54. rThis change in the drive rears is for the purpose of changing' the direction of rotation of the shaft Vl. said shaft rotating in one direction when the `roars 53 and 56 are in mesh, and the opposite, direetion when the ynears 54 and 57 are, meshing". l't is also the object to vary the aiufiunt of turning; movement of the shaft 5l.. said shaft being; rotated alternately through different distances. Thus.l the shaft 5l turns a Certain distance when the nears n3 and 56 are in mesh, and a greater distance when the 1ejeais and 57 are in mesh. This periodical and variable rotary inoveinent of the shaft 5l transmitted to the valves to be ground. thioiifi'li the l.frefiifs 49, :70. 47. 27 and 43. Fia. 3 shows the ,f1-ears 54 and 57 in mesh. and hence motion is transmitted by the ,'ear 50 to the gear and as the gears 49 and 43 are also in mesh, and the Q;ear 49 is fast en the shaft 5l.. said shaft also turns. and through the gears 45 and 46 the motion is transmitted to the earn shaft lVhen the shaft is shifted to direngage the nears s 5G und 53 57 and 54. and tov bring the gea into inesh. the shaft 5l. receives motion as before. but in the v'opposite direction. through the l.e'ear nenibers 49 and 53 as they are fast on the shaft. and li-ence the` cani shaft 35 is also again driven. rl`lie near 4S is now rotated by the rear 49. the 4rear ineinbers :"O and F4 turning idly on the shaft 5t. The motion transmitted to the gear 43 by the. .eear 49 is transmitted to the valve-engaging spindles 13 as before.

It will be evident from the foregoing that the valve ajrindinp; operation is effected bj, rotating` the valves on their seats, they be- 1 ,esatto ing rotated alternately in opposite"direc-` tions. The valves are given a greater num-` ber of turns in one direction than in the timed by the particular design of the cam groove 61. Referring 'to Fig. 5, it will be seenthat the cam groove has one portion e which is longer than the other portion 7J, and hence the shaft 55 will remain in the position to which it is shifted by the portion e for a greater length of time than in the position to which it is shifted bythe portion b. The operation of the spindle lifting cams is so timed that the lift occurs during the intervals when the direction of rotation of the shaft 5l is changed. By rotat-A ing the valves on their seats in one direc tion, then lifting the same and repositioning them on their seats, and continuing the rotary movement in the opposite direction, a goed seating is assured, and as the extent of the rotary movement in the respective directions is not the same, `the rotary movement always starts in a 'different position of the valves, so that the formation of continuous ridees or scratches is prevented.

The abutment 60 is on a post 63 rising from the floor of the housing 36, and said housing is also provided with suitable supports for the various shafts hereinbefore described. The shaft 44k enters the housing through a stuiling box 64." The housing will be made fluid-tight so that it may hold a lubricant in which 'the gears run.

From the top of the housing 36 rise standards supporting the cylinder block section l0 as shown in Fig. 2, These standards will be grouped to enter certain bolt holes in the part l0, and they are shouldered to prevent said part from slipping down. The spindles 13 are grouped to correspond to the grouping of the valves, so that they may be coupled to the valve stems when the part l0 is placed on the standards 65.

I claim:

l.. `In a valve grinding machine, a spindle, a head on said spindle, a valve-stem gripping means having base seating on the aforesaid head, a loose connection between the head and the base, anda yielding mem ber encircling the base and the head for normally holding said parts in alinement.

2. In a machine for grinding the valves of internal-combustion engines, a housing, standards rising from the housing for supporting a valve-carrying member above the housing, a plurality of valve-grinding spindles in the housing, said spindlesprojecting from the top of the housing and having their upper projecting ends provided with means for gripping the stems of valves projecting from the valve-carrying member,

and means in the housing for operating the spindles.

8. ln a valve grinding machine, a rotatable and longitudinally slidable valvegrinding spindle having valvegripping means, a bevel gear, driving connection between the bevel gear and the spindle, a pair of oppositely facing bevel gears in mesh with the aforesaid bevel gear, a shaft sup porting the pair of bevel gears, one of said gears being loose on the shaft and theother one being fast ontlle shaft, spur gears for rotating said pair of bevel gears, drive gears alterifiately engagea-ble with the spur gears, a drive shaft carrying the drive gears and longitudinally slidable to engage the spur gears, means for effecting such sliding movement of the last -mentioned shaft, a cam for sliding the spindle in a direction to lift the valve off its seat, a shaft carrying the cam, and a driving connection between the 61st-mentioned shaft and the cam shaft.

4. In a valve grinding machine, a rotatable and longitudinally slidable valvegrinding spindle having valve-gripping means, a bevel gear, driving connection between the bevel gear and the spindle, a pair of oppositely facing bevel gears in mesh with the aforesaid bevel gear, a shaft supporting the pair of bevel gears, one of said gears being loose on the shaft and the other one being fast on the shaft, spur gears for rotating said pair of bevel gears, drive gears alternately engageable with the spur gears, and for different lengths of time, a drive shaft carrying the drive gears and longitudinally slidable to engage the spur gears` means for effecting such sliding movement of the last-mentioned shaft, a cam for sliding the spindle in a direction to lift the valve ofl' its seat, a shaft carrying the cam, and a driving connection between the firstmentioned shaft and the cam shaft.

5. In a valve grindingr machine, a rotatable and longitudinally slidable valvegrinding spindle havingl valve-gripping means, a bevel gear, driving connection between the bevel gear and the spindle, a. pair of oppositely facing bevel gears in mesh with the aforesaid bevel gear, a shaft supporting the pair of bevel gears, one of said gears being loose on the shaft and the other one being fast on the shaft, spur gears for rotating said pair of bevel gears, drive gears alternately engageable with the spur gears, a drive shaft carrying the drive gears and longitudinally slidable to engage the spur gears, a collar on the last-mentioned shaft, said collar having a cam groove, a stationary abutment seating in the cam groove for effecting the sliding movement of the shaft, a cam for sliding the spindle in a direction to lift the valve olf its seat,

' porting the pair of bevel gears, one of said gears being loose on the shaft and the other one being fast on the shaft, spur gears for rotating said pair of bevel gears, drive gears alternately engageable with the spur gears, a drive shaft carrying the drive gears and longitudinally slidable to engage the spur gears, a Collar on the last-nientioned shaft, said collar having a Cani groove, a stationary abutment seating in the @am groove for eflecting the sliding Inovement of the shaft, said Cani groove being shaped to hold the drive shaft slid in one direction for a greater length of time than in the other direction7 a cani for sliding the spindle in a direction to lift the Valve oliq it seat, a shaft earrlving the vani. and a driving connection between the firstanentioned shaft and the earn shaft.

In testimony whereof I aliix my signature.

JAMES A. KNOlLlS. 

